Vinyl Siding is a Safe Cladding Option

Why does vinyl siding provide good fire performance? It is composed mainly of polyvinyl chloride, more commonly known as vinyl or PVC. Due to its chlorine base, vinyl siding does not ignite quickly and is inherently flame-retardant.

Harder to Ignite, Easier to Extinguish

All organic materials (that is, anything containing carbon) will ignite. But the higher the temperature a material has to reach before it flames, the safer it is.

PVC won’t ignite, even from another flame, until it reaches about 730°F (387°C) and won’t self-ignite until about 850°F (454°C). Those ignition temperatures are significantly higher than common framing lumber, which ignites from a flame at 500°F (260°C) and self-ignites at 770°F (410°C).

Also, ASTM D2863 tests show that rigid PVC’s high Limiting Oxygen Index means that it needs unusually high amounts of oxygen to burn and stay burning. Rigid PVC (vinyl siding) will not independently sustain combustion in air with a normal concentration of oxygen (about 21 percent) — so it extinguishes more easily.

Siding with Safety

This 2-page PDF explains the science behind why vinyl siding is inherently flame retardant and therefore a safe cladding option.


Official List of Certified Products and Colors

Vinyl and other polymeric siding, including insulated siding, are the only exterior cladding with product certification administered by an independent, accredited quality control agency that ensures products meet or exceed industry standards for performance. Hundreds of colors are also certified to meet or exceed ASTM standards for color retention, so you can be sure they will resist major color changes in a variety of climates. Currently, more than 800 products and more than 400 colors are certified to meet or exceed international standards for quality and color retention.

Certified Vinyl Siding: Quality and Color You Can Count On

Learn more about the specific performance standard, ASTM D3679, that vinyl siding must meet or exceed in order to be certified. Once a product is certified, it can achieve addition certification for color retention.